Optimization of chloride ion removal from desulfurization wastewater by electrocatalysis progress: application of Box-Behnken design

At present, it is difficult to remove the ultra-high concentration of chloride ions (about 20,000 mg/L) in desulfurization wastewater by traditional methods.The aim of this work was to evaluate the removal of chloride ions from desulfurization wastewater by electro-catalysis progress using Ti/SnO 2 -Sb 2 O 3 /PbO 2 electrodes.Response surface methodology (Box-Behnken design (BBD)) was employed to investigate the effects of current density, pH value, and electrolysis time on the removal of chloride ions.Three factors-three levels (BBD) was used for the optimization of process parameters.The predicted value in the established model agreed well with the actual value.The chloride ion removal reached 68.7% with an operating cost of 10.68 $/m 3 wastewater under the optimum conditions of the current density of 690 A/m 2 , pH value of 8, and electrolysis time of 90 min.